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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbdbe18d8e95a769ff97a402614cf6d6a0605eb19e99b3a871543fd36c7a0d25' 
  AND token = 'rHLSFI+EEcdnEcK0s6b6b2LGYxKuVNKUH6Dm4YniOV0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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