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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f3a4b1e3f651bb34771b2f15e69c682aebd34caf5611c02497d657df14b78ac' 
  AND token = 'ol26E6znJuuIgpMTZZ+BT0ODva/eDb/MGdtffzJ4GKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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