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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1965f78d77c4d37a7e0afdf34754da11f5b2b8ca8263a3f4d79d4f2dc0cc642' 
  AND token = '8i3AHBP4J7a0cuW95alHXR57LnGWrCa0CMmgMTMN2b4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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