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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b0b76cca7fb129b16990b81b1904e1a4f70f3f81e5eb41977f56c89d76c11ab' 
  AND token = 'NiaM0QveAkCA0ltIUNBW1yf9NealTRkRupYffaBVtc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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