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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee57e51d9df7571b689c2fca0e1360a45dda22b57e974f9e0c9a4e209b494e54' 
  AND token = 'MfZgMbZ9v1xiQdylpnFq42yu3fUomfYC2JTX6vjgpiA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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