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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec53907783f1b1f762a291494082d6f0f1c7f1b2be7f2cf510d215f5e5a373bd' 
  AND token = 'QHsXLBG4yu8Hpnldv1/Iqe38f1MTtXJXPJ3GmftlyXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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