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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bac87525f8a40b96fde01aaf325aba705db878764419612eb11bf060211efac' 
  AND token = 'cqcgqU9odEWKaMEzejVCS+bPa+1kfM+n/EWM51fZ3zs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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