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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38c207b5a5c314731889765916e45d0c517a38c909eb9c3c10b8068a4f06f755' 
  AND token = 'fkbsULxoEqmCJzI1g4Slfn9rPU/a49gDna+WpWbU8ro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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