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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11482821f8f285b9790fff5c2f89d911f5e74e7ab9399ebe37664fac2aabe41b' 
  AND token = 'tmUFeCTlhuy/2zftX1kvfgvf3+bvrFN9zWUJVFLiJws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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