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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee86e9a7e5660fd2bebc1f8c0c1cf8535a242b8ab1c70ab44cf77cbd7fe0fdb9' 
  AND token = 'GyO/4R11Xzs1pu1N3qikMsGGD1G6dq385hJR1cW7Ptk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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