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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e5d2f0618c5eed63a9114d017cb26d9c59325f405abd7870683202d45fc53df' 
  AND token = 'AjEvK4/8OIzEP6kPITco1whLrK1NKB43PKgGiVQg58c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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