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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf4e07897b31bc1e6bdf492f4af6bb7f13e6548a774b6cd7229c79768e75fe3e' 
  AND token = 'b+Xxov2J1szbt3PHITCr+INxhwhLFCW/99k/tjyUz8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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