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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fdadc686a31269d00bd05f797b0669b4c1249379a7b584567cd0799cfe81a35' 
  AND token = 'X/76rS/5vyibFDfnr21/CyxrN5AwvVMc5nRHuNoXJ0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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