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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2a4fa2da6b14392ea6a73e4f890ebe970f611de65c33592472128a0e72e2a5d' 
  AND token = 'lP/ovC57WqDVWKgteDAlkkmW+mk1j0VVF2osxnIHnps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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