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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f6d5475d89abf1179692895b82d2949f7d12582ffee090810d87de0952a8697' 
  AND token = 'JNYSrAKuKeDFUfcFluw6B+wUXQR2+FHP9aOPeWi8ZWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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