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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27b5279e3600cf8d7e5abef4c3c1dc544f1e86380e1ab2d194bf8690c18c6b65' 
  AND token = 'EuQibJgXH2285Xf2S+UY1CbE56yq5ipwgpyxVxw0K9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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