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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9e42f7499b184840255854cdce6c2b115f2234ee84ab58817f4c24afbbfe015' 
  AND token = 'f2DCrP59Qc1DfWhja2ZU5VZDF0isNW6dl2zLmwhTNQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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