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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98e85bd596c44fe7ad276887b511d9d25ad7d0330bbd005b07007c24fbb868be' 
  AND token = '7Oqk4F4aseSzEz3Xq13y3ai2OaBV+lEG4AHCDxlqb50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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