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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fb13190030906f919b0e98e72b2a4f9ca9377cd4e03dabbca661aa21bdec502' 
  AND token = 'BasvibkomC+Sxfojevn4B1HNZCFQ81i2j/67ZiweyIc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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