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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9eaf0bd0c77992db33e91146ede7bfc205bc5c4f200710b1ffafb3561cb4145c' 
  AND token = 'O1bvStq02y7mAV93PMrclhR7M19i4jeK8SigK3GKS2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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