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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94d6d3a3c18acb3dbfb14ca626d43cfc18edd59427164bdb49b6d1778e7b5921' 
  AND token = '8H4/kAfetsbGC4vw8uXt44aeQMtYroP7lmgeRjQoS/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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