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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74f23c628c0b181fe99f3bc0179b5ff9c3f639807dba2e00df5aa9f8133db1ff' 
  AND token = 'EeRItBDONy/Qh38IB0h0sw8W1juSZhbqEnbBK6FkA9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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