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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73356cd673344ee75182eae0ca3c35cb65b446af7b6c28a78242a658f36d1c62' 
  AND token = 'hcjLm8Xn/w3UvtV9v5lmOvrT51n5IpyZpZ2RCGOU7Qw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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