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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffd59e8f820bab0a8845440db035b89447ff5b212c7fc057f0f4d5b06d93d7c3' 
  AND token = 'PVve4lMeh7wB0l8aLOhXdRpowVeH3vL4L/w6OZItLDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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