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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04c6e9fe2ed88eee75bc843b2ed88d626385b40ae9209f85101ca1cb3761771c' 
  AND token = 'enqAjIdAHGrFSjXn5lCEZ87YApVvmbeRsL6JnS2diOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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