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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '198ad9afd5dcc3b722226fe0ac59bdd9179ec9c2b47cc6cb2386803fe07899c9' 
  AND token = 'vxVlkEr3KlfqTIzxZk5YIOxQ1AHIRAhmdk7g1ZZ+97c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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