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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f77ca6ecfa2aa5b23dc6b1533ea1e3360bd1d249d41a9675db9ba5f10a09a958' 
  AND token = '7awwdQvILvbR92u2u9SFCO25aAgpLNel+aNgp44isMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}