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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ceb2888b32756c1aa0fa5037f848b296d7634cbf84cf171fd2ebebf6f3c54494' 
  AND token = 'vMSg2NyLT0nZsOS/5tid1s/M3bUBjct1ZjY1EHekT/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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