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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ff3654efcb27e6bc146ac549daed088a120b472c2d092bcd2983aeb5279758b' 
  AND token = '4LvCHtKkV4xajWiAITW0CkKqsvM9lvJAGLLPIuI6T1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00081

JSON explain

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