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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00e1b4e3703384e191d8783fdd1872f65fc5ad53c943742cf55bbb026139e0e6' 
  AND token = 'NULK0+jPs+IZoseGJMAbOCw97ty4t+0HO4SM9005qfY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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