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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8af7c8d5a11d4537c581fd8cc90499a5e9fc2ef1221c4ccf5e6b563bb94a5d69' 
  AND token = 'k1pYEqcmiDlsJBqX+4BlkJ5CcfxMwdXpmFENLTB6LDQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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