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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1079016b03d97c48cf9572b0f5d193b8b67947a623eac17caa0fa7205dfec0a' 
  AND token = 'ckex6NZLlPNq+GJQ42ng8zGeRrODiRGnuw8hfDwve5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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