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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be655a320f0a289a6053314b3e4103e7ec588cedf7a43aeb44425e0fd395d0d1' 
  AND token = 'dPTq6ruj8oJIrWlgE7UR0Vqdnb7EpvRT6NYfWROuH3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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