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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a113bb7899095db26bf757570b62587b693e82a81296f8702ecd92278ee84e87' 
  AND token = 'r0yeY8WQVFp2tQfSTkzY/Oa5VEVh25xXJvYeGw/X5BQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00080

JSON explain

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