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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8eafa81c63e192103b20d02cdc71768c912630c644b6d9654947ae915a629f55' 
  AND token = 'e1pCp/Q0Hi+XQro2hANQ2A4QE49ll512NndOcNg1YV0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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