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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '807b2552af4332f396e4e315dc1c0884d9148bf5e39b02cba83f19dde4bc82cc' 
  AND token = 'EE0Km5FbUzp+kU9Bmu8rqguVSmVoglbx9l22t2PaAeY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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