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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b70c10d817312495a06e4b7e788bc25ba223fbdc36ac4783bcd78bef2db9bed' 
  AND token = 'k1aTOrozJCjmyvGB/mHIBynxcHIyDvDm1uMatW+Q4w0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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