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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e27d42c100b684d15ed2f6c595f8f27f106226fd847b40a6762a56307694d8e4' 
  AND token = 'BkPVUSqUHJBWbbhQjuO8IVoTh0fjxEaNfvSS0kRn9sQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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