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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcf9d37bcf353d94d3138e4c6240b4e409bbab56468202ea89fa1f2690909b45' 
  AND token = 'KRSY6mVTmrYQwwoI8SfjCqlf3ieCnevBvEyx/YYMme8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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