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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed7aaa8067f35df8aa65fac7585eb226c12086651d44401a0b59c1907606a6ed' 
  AND token = '651+PaCjRpBSC2mk1t7Vj981v6QR76vkojLwsOSaat8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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