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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c262276c6e3cc485ef0f39050fed9df1ad4a6eb6560dec3fcbd3fabf36c9a814' 
  AND token = 'b4hJ3YqASjTsEE8CgRqu2BZ2vsSjQ1tFJkn715UWHB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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