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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea7b85b9fb78f9b43d17c0e1993e4c296bba4cf73e37cfade534dee342aa7426' 
  AND token = 'CiMxrwEpiRtQknHveXbLlbEXj13WySHkLTWUEEGRphY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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