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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a89a8403a1b6a28170bedfbf41262f70aeefe4c4b5d55f9ab989ed436cde7b52' 
  AND token = 'RupjWSbKfKP/Arc1I6YuipodVASO3zhdZNDOa1rLPgY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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