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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6119fea0951f1cedbc9d5f64b3292aaee0546054520944910ca93fdd746c9837' 
  AND token = 'fhzteFoF0b+Mcmp7l8kew0bPc4Qo+ZeuKUN9PTa3fUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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