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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd5762a2a0c2b829e3acc91901ea6e112ab7a2d431bb6978ff7e92b506dd006a' 
  AND token = 'QEUx+Rvly2GjNpeBSGu+16JqNIZLOdqkepcwrOZqCII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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