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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc3a21286f47790cb0438f85f16908e23411ef7fe5cbd2f5d9cf2f9547257b37' 
  AND token = '9rqCpEUd731sw3jbWyrFrpPstoXg71xY+QjU/+sWKmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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