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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbeee833e6fa14d15193c39b740ee94982fe95c4bbe2532c9875d676b93d284c' 
  AND token = 'Nv5flOndUfUI+2iKkVS82enD5Th7YHG+K06MCFna0TQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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