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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37ae405a9670faa5224f97c36cd29d157f29cd16840d8d8b7962cbd15dab09a5' 
  AND token = 'yj15rnH0m8euXXS9WSNN/dg4ey1K10Jzhsl0vzl4hX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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