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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abdfed14c4f6ad21f0cf67f185129a1f14077f00bf92cadff96767c546d99cb2' 
  AND token = '58Y6oM4iXUBkD07RNi4ufA+BWxsnhabs/fhNETxTZ40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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