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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '132b2b812c5d7a6c3e8f1760153d1009c31c29d91887ecb8ff3b6f81f8bcab99' 
  AND token = 'acJvYcs8DOerYCb6qtSfOq6v4cVg0q+jnzbmi2RSJLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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