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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5e64f7197a29317dcde11a7bfe94c8b254cea5b54e7cc671104a41d227c009e' 
  AND token = '03TwkzIBdIyZRtwwf4CQP1ku+Rt2hR94PQy6E1kkz44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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