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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af489e3e96e814d2982475c83a3e37d2ff0ed918194c0d5483266b7830d4ee10' 
  AND token = 'odEAuSpaSfFyqhI0QlGh1EWE3Qa48EzED9bLMbHc+2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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