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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0b807509ab620db3e6b8264023d0520bf792b3e21ec1605d5b4120bb3b29d46' 
  AND token = 'jmUZppoJMMiRJPsVnrAYaLnElFdetd8NpqvFkOk5kTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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