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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e250988be4d9dc01550726ad0ec83435b76f6b179ae991c9cdf1b7e6609189b1' 
  AND token = 'GowG/cs8D5Xq8sSZ3dIDB7/CqZwYgCC2hcEALF6Ffg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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