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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0663ea01243594d3fc6c457bf9ca6b744a370e3a8d3b80dcf70ff808aec97e81' 
  AND token = 'libGEjNOiiReGs1nCy2gDeMV8nZIbQn+SIAG+wR4x8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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