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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '524c79ac7feb6cbbb891861f4af6626a4b5aa9d4b0f23b30dd98edaf97f20b49' 
  AND token = 'xO8duuoHWe6Pk1LgVXPEUwZx5r47X2tw+pOvSLiy8vc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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