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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e43c0567d6135d345166f196219490309c619a726418089bdf6073a0c540273e' 
  AND token = '3lA09GOOgIqHGZ7o7GkjdfeCIffXl6TcUyrSow94u0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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