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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29b42542c8f5699dda1e05733e434deae89f13cc7541471eb8ffc91ad96bcf46' 
  AND token = 'waiO3OyDK5bmGpwceYXeyQ76nc/IS78rDYcR3v35NXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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